package main 
import "fmt"
func main() {
	var score int = 75
	if (score >= 90) {
		fmt.Println("A")
	} else if (score >= 80) {
		fmt.Println("B")
	} else if (score >= 70) {
		fmt.Println("C")
	} else if (score >= 60) {
		fmt.Println("D")
	} else {
		fmt.Println("E")
	}
}